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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Examination [Line Items]        
Effective tax rate on income (loss) before taxes 19.00% 29.60% 18.70% 34.20%